scholarly journals Nanocellulose from Unbleached Hemp Fibers as a Filler for Biobased Photocured Composites with Epoxidized Cardanol

2021 ◽  
Vol 5 (1) ◽  
pp. 11
Author(s):  
Sara Dalle Vacche ◽  
Vijayaletchumy Karunakaran ◽  
Silvia Maria Ronchetti ◽  
Alessandra Vitale ◽  
Roberta Bongiovanni
Keyword(s):  
Room Temperature ◽  
Raw Materials ◽  
Curing Process ◽  
Solvent Exchange ◽  
X Ray Diffraction ◽  
Light Spectrum ◽  
Biomass Waste ◽  
Hemp Fibers ◽  
X Ray ◽  
Rubbery State

Biobased composites were successfully prepared using raw materials derived from biomass waste, i.e., an epoxy resin obtained from cardanol and nanocellulose from unbleached hemp fibers. The composites were prepared by solvent exchange and an impregnation of the cellulosic mat with the resin, followed by photocuring. Quantitative conversion was obtained, despite the high amount of fibers (30 wt%) and their absorbance in the UV region of the light spectrum. X-ray diffraction confirmed that the crystalline structure of cellulose did not change during the impregnation and curing process. The cured composites were flexible, hydrophobic, water resistant, transparent with a yellow/brown color, and in the rubbery state at room temperature.

Preparation and Electrochemical Performance of Mn3O4/GR Composites Electrode Material in Supercapacitors

2019 ◽  
Vol 807 ◽  
pp. 50-56
Author(s):  
Yun Long Zhou ◽  
Zhi Biao Hu ◽  
Li Mei Wu ◽  
Jiao Hao Wu
Keyword(s):  
Room Temperature ◽  
Raw Materials ◽  
Precipitation Method ◽  
Electrochemical Performances ◽  
Manganese Sulfate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Co Precipitation ◽  
A Current ◽  
Discharge Test

Using hydrated manganese sulfate and general type graphene (GR) as raw materials, Mn3O4/GR composite has been successfully prepared by the liquid phase chemical co-precipitation method at room temperature. X-ray diffraction (XRD) was used to investigate the phase structure of Mn3O4powder and Mn3O4/GR composite; The electrochemical performances of the samples were elucidated by cyclic voltammetry and galvanostatic charge-discharge test in 0.5 mol/L Na2SO4electrolyte. The results show that the Mn3O4/GR composite possesses graphene phase and good reversibility; the composite also displays a specific capacitance of 318.8 F/g at a current density of 1 A/g.

A Chemical Solution Route to Rapid Synthesis of Homogeneous Bi100−xSbx Alloys Nanoparticles at Room Temperature

2007 ◽  
Vol 7 (2) ◽  
pp. 525-529 ◽  
Author(s):  
Bo Zhou ◽  
Jun-Jie Zhu
Keyword(s):  
Room Temperature ◽  
Raw Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Solution Route ◽  
Diffraction Patterns ◽  
Co Reduction ◽  
Chemical Solution Route

A chemical co-reduction route in aqueous solution was developed to synthesize Bi100−xSbx alloys at room temperature. The hydrolyses of Bi(III) and Sb(III) were effectively avoided by selecting proper raw materials and coordinator. X-ray diffraction analysis indicated that the as-prepared Bi100−xSbx alloys were homogeneous and phase-pure, and the Bi/Sb ratios in the alloys were very close to those in the aqueous solutions. The transmission electron microscope observation showed that the as-prepared Bi100−xSbx (x = 0∼100) alloys were particles with a size of tens of nanometers. The selected area electron diffraction patterns confirmed the high crystallinity, the homogeneousness, and the composition controllability of as-prepared alloys. All these characters and the nanometer-scaled size of the alloys are believed to be beneficial to the thermoelectric property of the Bi100−xSbx alloys.

scholarly journals Sintering and dielectric properties of a technical porcelain prepared from economical natural raw materials

Cerâmica ◽  
2016 ◽  
Vol 62 (364) ◽  
pp. 405-412 ◽  
Author(s):  
S. Kasrani ◽  
A. Harabi ◽  
S.-E. Barama ◽  
L. Foughali ◽  
M. T. Benhassine ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Room Temperature ◽  
Raw Materials ◽  
Dielectric Measurements ◽  
X Ray Diffraction ◽  
Potash Feldspar ◽  
Spectroscopy Analysis ◽  
X Ray ◽  
Microscopy Images ◽  
Technical Porcelain

Abstract In this study, the production of a technical porcelain, for the ceramic dielectric applications by using economical natural raw materials, was investigated. The basic porcelain composition was selected consisting of 30 wt% kaolin, 45 wt% potash-feldspar and 25 wt% quartz. The obtained phases in the sintered samples were investigated by X-ray diffraction, Fourier transform infrared spectroscopy analysis, and scanning electron microscopy images. It has been confirmed by these techniques that the main crystalline phases were quartz and mullite. Dielectric measurements of technical porcelains have been carried out at 1 kHz from room temperature to 200 °C. The dielectric constant, loss factor, dielectric loss tangent, and resistivity of the porcelain sample sintered at 1160 °C were 22-25, 0.32-1.80, 0.006-0.07, and 0.2-9 x 1013 Ω.cm, respectively. The value of dielectric constant was significantly high when compared to that of conventional porcelains which did not exceed generally 9.

Preparation of Strontium Ferrite Powders by Mechanochemical Process

2011 ◽  
Vol 110-116 ◽  
pp. 1736-1740 ◽  
Author(s):  
Ju Hua Luo
Keyword(s):  
Magnetic Properties ◽  
Room Temperature ◽  
Single Phase ◽  
Raw Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Starting Mixture ◽  
Ft Ir ◽  
Mechanochemical Treatments ◽  
Firing Method

Sr-ferrite powders were preparated by mechanochemical treatments using SrCO3 and Fe2O3 as raw materials. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometry (VSM) were employed to evaluated the morphologies, structures and magnetic properties of samples. The results indicated that the starting mixture became amorphous stage after ball-milled for 30h, and single phase SrFe12O19 could be obtained after annealed at 900°C for 2h. And the saturation magnetization was 58.2Am2/kg, and coercivity was 281.2 kA/m at room temperature. In comparison with the traditional firing method , the mechanochemical method benefited achieving the higher coercivity, which indicated that the samples had a better magnetic properties.

An Improvement on Tracking Resistance of Silicone Rubber Filled with Micro-Wollastonite/Gehlenite Synthesized by Solid-State Reaction

2021 ◽  
Vol 902 ◽  
pp. 107-111
Author(s):  
Pattarabordee Khaigunha ◽  
Tanakorn Wongwuttanasatian
Keyword(s):  
Silicone Rubber ◽  
Room Temperature ◽  
Raw Materials ◽  
Filler Loading ◽  
Test Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Tracking ◽  
Long Time ◽  
Scanning Electron

Enhancement of the room temperature vulcanization silicone rubber (RTV) tracking resistance with various filler loadings of synthesized wollastonite against electrical surface tracking was prepared. The X-ray diffraction (XRD), Scanning electron microscope (SEM), and X-ray fluorescent (XRF) techniques were involved in characterizing the synthesized substances. The test method IEC-60587 standard was employed to evaluate the surface tracking resistance. The results obtained from the XRF technique confirmed that the raw materials could be synthesized for wollastonite, while the XRD and SEM techniques revealed the formation of wollastonite (CaSiO3) associated with gehlenite (Ca2Al2SiO7). Moreover, it was found that the electrical surface tracking resistance of composite insulation takes a long time to track when the filler loading is increased more than 5 phr.

Preliminary Research on the Preparation of Ce-Doped TiO2 by Sol Method

2013 ◽  
Vol 785-786 ◽  
pp. 745-748
Author(s):  
Deng Liang He ◽  
Shi Xin Fang
Keyword(s):  
Electron Microscope ◽  
Methyl Orange ◽  
Scanning Electron Microscope ◽  
Room Temperature ◽  
Raw Materials ◽  
Catalytic Performance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Preliminary Research ◽  
Scanning Electron

butyl titanate, water and anhydrous ethanol were used as raw materials; Cerium-doped TiO2 was prepared by sol method at room temperature. Then it was characterized by X ray diffraction, Raman spectra, Uv-vis absorption spectra and Scanning Electron Microscope. The results show that TiO2 crystal can be got by sol method at room temperature. Cerium-doped TiO2 has the better catalytic performance for methyl orange.

Syntheses, Structures and Properties of Two Cd(II) Complexes Based on the 2-(1H-Imidazol-1-yl-methyl)-1H-benzimidazole Ligand

2012 ◽  
Vol 67 (7) ◽  
pp. 678-684 ◽  
Author(s):  
Xiao Su ◽  
Ting Li ◽  
Yu Xiu ◽  
Xiangru Meng
Keyword(s):  
Ir Spectra ◽  
Single Crystal ◽  
Room Temperature ◽  
Chain Structure ◽  
Fluorescence Properties ◽  
Solvent Exchange ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structures And Properties

Two new 1-D Cd(II) complexes, {[Cd(imb)(μ2-Cl)Cl]·CH3OH}n (1) and {[Cd(imb)(μ2- Cl)Cl]·DMF}n (2), have been synthesized by the reactions of the unsymmetrical ligand 2-(1Himidazol- 1-yl-methyl)-1H-benzimidazole (imb) with CdCl2·2.5H2O in methanol or methanol=DMF solution at room temperature, and structurally characterized by single-crystal X-ray diffraction. Complex 1 displays a ladder-shaped chain in which [Cd2Cl4] units are linked to each other through two bridging imb ligands. Complex 2 features an infinite looped chain structure composed of two kinds of rings, the smaller [Cd2Cl2] ring and the larger [Cd2imb2] ring, connected alternately via their Cd(II) ions. The different architectures of complexes 1 and 2 can be generated by solvent exchange. The IR spectra and fluorescence properties of the complexes have been also investigated.

Solvothermal Synthesis and Characterization of Zn(NH3)CO3 Single Crystal

2004 ◽  
Vol 817 ◽  
Author(s):  
Fushan Wen ◽  
Jiesheng Chen ◽  
Jin Hyeok Kim ◽  
Taeun Kim ◽  
Wenlian Li
Keyword(s):  
Solvothermal Synthesis ◽  
Room Temperature ◽  
Raw Materials ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Photoluminescent Property ◽  
X Ray ◽  
3 Dimensional ◽  
Zinc Carbonate

AbstractA new 3-dimensional zinc carbonate Zn(NH3)CO3 has been synthesized from a glycol system with urea and zinc acetate as raw materials. The crystal structure and photoluminescent properties have been investigated using X-ray diffraction, smart CCD and FL. The compound had an orthorhombic system with space group of Pna21 with M = 142.41, a = 9.1449(18) Å, b = 7.5963(15) Å, c = 5.4982(11) Å, V = 381.95(13) Å3, Z = 4, R = 0.0285 and RW = 0.0745. The NH3 and CO32- were connected through the Zn-N bond and Zn-O bond in the symmetric unit. Photoluminescent property was observed in the compound at room temperature and the exited and emission peaks were located at about 350 nm and 426 nm, respectively.

Preparation Process of BST Dielectric Ceramics

2016 ◽  
Vol 859 ◽  
pp. 13-17
Author(s):  
Li Ping Zhao ◽  
Wen Hong Tao ◽  
Xing Hua Fu ◽  
Wen Zhe Cao ◽  
Guo Yuan Cheng ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Room Temperature ◽  
Raw Materials ◽  
Sol Gel ◽  
Synthesis Temperature ◽  
Strontium Nitrate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Good Crystallinity ◽  
Dielectric Ceramics

Ba0.5Sr0.5TiO3 powders were prepared via a new sol-gel method with titanium oxide, strontium nitrate, and barium nitrate as raw materials. The microstructure and electrical properties were characterized by field scanning electron microscopy, x-ray diffraction and impedance analyser. When the PH = 4, n (CA): n (metal oins) = 3:1 and the synthesis temperature is 800 °C, Ba0.5Sr0.5TiO3 powders were obtained with good crystallinity. BST ceramics sintered at 1250 °C for 2h exhibited good dielectric properties (εr = 930, tanδ = 0.08) at room temperature and f =1 KHz. The relatively low sintering temperature and excellent dielectric properties would make these ceramics promising for applications in electronics.

Electron Microscopy of Human Gallstones

1971 ◽  
Vol 29 ◽  
pp. 296-297
Author(s):  
C. Wolpers ◽  
R. Blaschke
Keyword(s):  
Electron Microscopy ◽  
Room Temperature ◽  
Bile Pigment ◽  
X Ray Diffraction ◽  
Triclinic Crystal System ◽  
X Ray ◽  
Follow Up Study ◽  
Infra Red ◽  
Main Components

Scanning microscopy was used to study the surface of human gallstones and the surface of fractures. The specimens were obtained by operation, washed with water, dried at room temperature and shadowcasted with carbon and aluminum. Most of the specimens belong to patients from a series of X-ray follow-up study, examined during the last twenty years. So it was possible to evaluate approximately the age of these gallstones and to get information on the intensity of growing and solving.Cholesterol, a group of bile pigment substances and different salts of calcium, are the main components of human gallstones. By X-ray diffraction technique, infra-red spectroscopy and by chemical analysis it was demonstrated that all three components can be found in any gallstone. In the presence of water cholesterol crystallizes in pane-like plates of the triclinic crystal system.

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